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通过理论模型和界面顶出实验分析了微观结构对碳/碳复合材料界面性能的影响机制。使用高分辨Micro-CT系统获得C/C复合材料界面的微观结构特征,并对界面的微观结构特征进行统计分析,得到界面微观结构尺度分布的概率密度函数。对C/C复合材料的界面层建立力学分析模型,计算获得C/C复合材料界面力学性能,在计算过程中引入界面微观结构的随机性统计分布,获得C/C复合材料界面力学性能的分布规律。设计纤维束顶出实验,测试分析C/C复合材料的界面力学性能。将力学分析模型的计算结果与界面顶出实验获得的实验结果进行对比分析,表明通过模型计算获得的界面性能的均值和离散度与实验获得的结果具有较好的一致性。
The influence of microstructure on the interfacial properties of carbon / carbon composites was analyzed by theoretical model and interface ejection experiment. The microstructure characteristics of C / C composites were obtained by using high-resolution Micro-CT system. The microscopic structure characteristics of the interface were statistically analyzed, and the probability density function of interface microstructure scale distribution was obtained. The mechanical analysis model of C / C composites interface was established, the mechanical properties of C / C composites were calculated, and the statistical distribution of interfacial microstructure was introduced to obtain the distribution of mechanical properties of C / C composites law. The fiber bundle ejection experiment was designed to test the interface mechanical properties of C / C composites. Comparing the calculation results of mechanical analysis model with the experimental results obtained from the interface ejection experiment, it shows that the average and the dispersion of the interface performance obtained by the model calculation are in good agreement with the experimental results.